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Roger Federer celebrates his straight sets win over Kei Nishikori in the semifinals in Halle.

Story highlights

Roger Federer into final of ATP event in Halle

Federer will play Alejandro Falla of Colombia in final

Grigor Dimitrov and Feliciano Lopez in Queen's Final in London

Dimitrov beats Stanislas Wawrinka in semifinal upset

Roger Federer warmed up for another tilt at Wimbledon by reaching the final of the grass court warmup tournament at Halle for the ninth time with a straight sets victory over Japan's Kei Nishikori Saturday.

The 32-year-old Swiss will play Colombia's Alejandro Falla in the title match, but Federer's Davis Cup teammate Stanislas Wawrinka will be kicking his heels Sunday after being upset by Grigor Dimitrov of Bulgaria in the semifinals of the Queen's Club event in London.

Top seed Wawrinka, the Australian Open champion, lost 6-2 6-4 to Dimitrov, who has been compared in playing style to Federer, although both dislike the tag of "Baby Federer" he has earned in media circles.